Question

The cost of running a bus from A to B, is rs., where v km/h is the average speed of the bus. When the bus travels at 30 km/h, the cost comes out to be rs. 75 while at 40 km/h, it is rs. 65. Then the most economical speed (in km/h) of the bus is 

A

45

B

50

C

60

D

40

Medium

Solution

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Correct option is C)
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